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You need 91 Octane, which you can use 93 octane and 89 octane mix. which is Premium and Mid grade fuel.
The 2005 Volvo S40 only has an integrated fuel filter with the fuel pump in the tank. No additional external filter exists.
The 2005 Volvo S40 only has an integrated fuel filter with the fuel pump in the tank. No additional external filter exists.
There is no Volvo car with a two cylinder engine.
The 2005 Volvo S60 runs on premium unleaded (required).
The 2005 Volvo S80 runs on premium unleaded (required).
The 2005 Volvo XC70 runs on premium unleaded (required).
The 2005 Volvo XC90 runs on premium unleaded (required).
91 Octane Premium Fuel. Use nothing less or nothing higher.
Some additives I know of Ethyl methyl lead (octane booster and upper cylinder lube) Methyl Benzene (octane booster)
95
87 octane regular unleaded.